The Temple of Light is an ancient structure built by elves to protect the death altar. The Mourners will do anything to get their hands on this place, in order to gather a sufficient amount of death energy to break the Dark Lord from his imprisonment and restore Prifddinas without the help of the other seven clans.

Swarming with level 95 Shadows that can easily hit 200's, it is discovered during Mourning's Ends Part II. The temple is a complex maze, with the manipulation of light being necessary to proceed.

For players who haven't completed "Within the Light", mourner gear is required to enter through the front door in West Ardougne since it is in the basement of Mourner's HQ. If the player has completed Mourning's Ends Part II, the Crystal trinket is also needed or else the player will be stopped with the message, "A strange force blocks your path". The New key is required to enter the dungeon from the basement; it can be found on the Head Mourner's desk in the basement.

Players then proceed to the dwarf camp at the southern wall, and use the tunnel to the Death altar. Alternatively, if you have finished Within the Light, you can teleport to the temple using a crystal seed. The player could also enter the Abyss, go to the death rift, and then use the portal to teleport next to the altar. Using a death altar teleport to teleport into the altar is also a viable option.